[ipv6hackers] Dynamic prefixes & privacy (was: IPv6 prefix changing)

[Alex List]

Hi

> If I mis-understood you please tell me.
Probably I did

> Yes and no :-) ISPs got the RADIUS logs. If users got fixed IP addresses
> it's very easy to track them for third parties. If users got dynamic IPv6
> subnets it's not much harder to track them by their IP address. The third
> party just needs to do some mapping of networks, ISPs and locations. Might
> be even a service of another company. There is a lot of geolocation data in
> the Internet freely available. Add the automatic interface address and you
> can identify the user. You're even able to see if the user switches the ISP
> or moves to another area (if it's away far enough - access-router-wise). For
> dynamic IPv4 addresses it's not that simple. The marketing company needs to
> add some of the common webbrowser-based methods.

Do you mean that if prefixes were at least as random as IPv4 addresses
and privacy extensions were in place, then marketing companies would
need to rely on webbrowser-based methods?